PERMOD Perimeter

The PERMOD perimeter is a hybrid of the inner and outer perimeter. It is implemented primarily for modules that might have a large number of queue instances, and cannot afford the latency for entering the outer perimeter. Because it is a hybrid, PERMOD perimeters cannot have an outer perimeter, and modules that have D_MTPERMOD and D_MTOUTPERIM defined will fail at open. As PERMOD perimeters are implemented as inner perimeters, they share all the concurrency states as the inner perimeter, see Table 12–2.